[PATCH] btrfs: fix memdup.cocci warnings

[Julia Lawall]

From: kernel test robot <l...@intel.com>

fs/btrfs/send.c:3854:8-15: WARNING opportunity for kmemdup

 Use kmemdup rather than duplicating its implementation

Generated by: scripts/coccinelle/api/memdup.cocci

Fixes: 28314eb24e6c ("btrfs: send, recompute reference path after orphanization 
of a directory")
Signed-off-by: kernel test robot <l...@intel.com>
Signed-off-by: Julia Lawall <julia.law...@inria.fr>
---

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/fdmanana/linux.git 
misc-next
head:   28314eb24e6cb8124d1e5da2ef2ccb90ec44cc06
commit: 28314eb24e6cb8124d1e5da2ef2ccb90ec44cc06 [2/2] btrfs: send, recompute 
reference path after orphanization of a directory
:::::: branch date: 17 hours ago
:::::: commit date: 17 hours ago


 send.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -3851,10 +3851,9 @@ static int refresh_ref_path(struct send_
        char *name;
        int ret;

-       name = kmalloc(ref->name_len, GFP_KERNEL);
+       name = kmemdup(ref->name, ref->name_len, GFP_KERNEL);
        if (!name)
                return -ENOMEM;
-       memcpy(name, ref->name, ref->name_len);

        fs_path_reset(ref->full_path);
        ret = get_cur_path(sctx, ref->dir, ref->dir_gen, ref->full_path);